Bosch 4306 Service Manual download pdf (Page 25)

• DOK-POWER*-KDV*2.3****-ANW1-EN-E1,44 • 06.97

4.1. Differentiating features of the power circuits

4. Control circuits

by the

NC control unit

by the drive

electronics

controlled braking

for an E-Stop or

a power failure

Bringing the drives

to a standstill with

faulty drive electronics

without DC bus

dynamic braking

with D.C bus

dynamic braking

Figure 4.1: Differentiating features of the power circuits

DC bus dynamic braking is an additional safety factor when braking the drives

to a standstill in the event of a fault in the drive electronics.

Synchronous motors are always braked to a standstill with

DC bus dynamic

braking

regardless of whether the drive electronics are functioning or not.

Asynchronous drives do not brake when DC bus is short-circuited!

Without dynamic braking

synchronous motors will coast uncontrolled if the

drive electronics are not functioning.

The drive control brings the drives to a standstill for an E-stop or as a result of

a power failure.

In the event of an E-stop or if the drive-internal monitor is tripped, the drive

control will switch velocity to zero. The drives brake uncontrolled at maximum

torque.

It is necessary with some applications (e.g., electronically-coupled gear

cutting machines) that the NC control unit brings the drive to a standstill in an

E-stop or in the event of a power failure.

The drives are braked to a standstill by the NC control unit in the event of an

E-stop or if the drive-internal monitor is tripped.

Bringing the drives to a

standstill with an error

in the drive electronics

or without DC bus

dynamic braking

Controlled braking of

the drives with an

E-Stop or power failure

with command-to-zero,

or position controlled

by the NC control unit

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Bosch 4306 Service Manual Page 25

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